To convert pints to fluid ounces, you can use the conversion factor that 1 pint is equal to 16 fluid ounces.
Therefore, if Fernando bought 8 pints of milk:
\[ 8 \text{ pints} \times 16 \text{ fluid ounces/pint} = 128 \text{ fluid ounces} \]
So, Fernando bought 128 fluid ounces of milk.